Closure for bottles and jars



May 26, 1936. A. KOHRER 2,041,76

` CLOSURE FOR BOTTLES AND JARS .Original- Filed Nov. 18, 1931 I i@ i5 g io Patented May 26, l93

CLOSURE FOR BOTTLES Alfred Kolhrer, rIoledo, 01u10, assigner to 'llhe 'Closure Service lllompany, rlloledlo, Ohio, a corporation of Ohio Application November 18, 1931, Serial No. 575,739 Renewed October l2, 1935 '7 Claims.

present invention, consists of inner and outer caps secured together by interlocking the lower marginal portions o-f the flanges in a fashion to form an internal continuous bead. The attaching threads or other projections having a like function, are provided on the inner cap. Such a construction results in the provision of .a closure in which the outer flange is perfectly smooth and has an unbroken surface throughout. Among the advantages of this construction is the provision of a. closure which may be finished in any desired color without having the color scheme broken by the presence of an external bead or/and raw edge of metal.

Other objects will be in part apparent and in part pointed out hereinafter.

In the drawing:

Fig. 1 isa fragmentary elevational view showing my improved closure attached to a container.

Fig. 2 is a sectional view vof the outer cap or shell prior to attachment thereof to the inner cap.

Fig. 3 is a sectional view of the inner cap prior to assembly.

Fig. 4 is a sectional View showing the inner and outer caps assembled.

Fig. 5 is a detail sectional View showing the manner in which the flanges of the inner and outer caps are secured together.

Fig. 6 is a sectional view showing in considerable detail the manner in which the cap flanges are interlocked.`

Fig. 7 isv a, sectional view showing in detail another form of two piece closure.

Fig. 8 is a fragmentary sectional View of a single piece cap in which the attaching flange is formed in accordance with the present invention.

One form of my improved closure is shown in Figs. 1 to 6 inclusive. In this form the closure consists of two caps telescoped one over the other and secured together in such fashion that an internal beadis formed at the lower margin of the flanges which constitute portions of the caps. The result is the provision of a perfectly smooth external flange on the finished closure, a flange entirely free from any surface irregularities. The inner cap includes a circular top portion l0 and an integral depending attaching flange ll having threads l2 formed t ereon. Below' the threads the flange diameter is enlarged slightly `within the annular space and the walls curved outwardly, downwardly,` and thence inwardly a short distance providing, in effect, a continuous inwardly facing channel i3 which is substantially U-shaped in cross-section. The exposed raw edge of the ange facesinwardly and is adapted for contact with a portion of the outer cap Ul or shell as will be brought out presently.

The outer cap Ml or shell comprises a circular top vlli and a, depending ange lli thereon. The flange i6 o-n the outer cap or shell is of somewhat greater depth than the threaded flange on the inner cap. In assembling the caps, the shell lll is placed over the inner cap. That portion. of the outer flange lli extending beyond the screw threaded flange Il is rolled inwardly over the raw edge of the screw threaded flange and then pressed into the channel I3. In this assembly operation, sufficient pressure is applied in folding the lower margin of the outer flange to cause the raw edge of the attaching flange to bite into the adjacent surface of said outer flange. This feature will be apparent in Fig. 6 in which it will also be noted that the channel i3 and inwardly folded portion of the outer flange in addition to securing the two caps together and preventing relative movement between the inner and outer caps, provides a stiffening bead Il'l lying dened by a vertical downward extension of the outer surfaces of the completed closure and a vertical downward extension of the threaded portion of the inner cap. As a result of this construction the entire outer surface of the flange of the completed closure is perfectly smooth and does not present any raw metal edges. Moreover, the raw edge of the bead l'l is protected by being projected into the channel I3 directly beneath the lower part of the screw threads. Further, the bead, although formed.internally of the closure, does not interfere with application of the closure to a jar or other container, and, in fact, facilitates such application because of its functioning as a guide for centering the closureV upon the receptacle to be sealed thereby. A

It will be observed that the lower marginal portion of the outer cap flange which is folded around the lower margin of the inner cap and forms the bead Il, is of greater interior diameter than the greatest interior diameter of the screw threaded part of the cap. 'I'he finished cap is thus provided with an entrance portion, the diameter of which is sufciently great to prevent interference with the screw. threads on the container to which the cap is applied and permits the cap to have a close t on the threads of said container.

In another form of the invention (Fig. '7) the threaded attaching flange I22L at the lower point of termination of the threads is extended radially outward and thence downwardly and inwardly forming a channel I8 which is substantially V-shaped in cross-section. -The outer wall I9 of this channel converges downwardly and is adapted to project into a bead 20 provided at the lower edge of the outer flange Ilia. In this form of closure the free edge portion of the outer flange forming the bead 20 is firmly pressed against the inner surface of the downwardly converging wall I9 of the channel I 8, such pressure tending to expand the wall and force it into parallelism with the outer flange I6a and thereby producing such frictional contact between the two flanges as will prevent relative rotation or other movement of the in ner and outer caps.

In Fig. 8, I have shown a form of single cap in which the lower edge portion of the threaded attaching flange 2| is rolled inwardly and upwardly to provide an obscured bead, the diameter of which is greater than that of the threads. This construction greatly facilitates application of the closure to bottles or the like containers, in addition to enhancing the appearance of the closure by placing the bead and ordinarily eX- posed raw edge entirely out of View.

Modifications may be resorted to within the spirit and scope of the appended claims.

What I claim is:

l. A closure comprising an inner cap having a circular attaching flange provided with screw threads, said screw threads terminating at a point short of the lower margin of the flange, said flange having that portion below the threads extended outwardly, downwardly, and thence inwardly presenting an inwardly facing edge of metal and forming-an inwardly facing continuous channel, and an outer cap telescoped over the inner cap and including a depending flange, said flange having its lower marginal portion folded inwardly and thence upwardly over and in c ontact with said edge and into the channel to thereby secure the two caps together and form an internal continuous bead.

2. A closure comprising an inner cap having a circular attaching flange provided with screw threads, said screw threads terminating at a point short of the lower margin of the flange, said flange having that portion below the threads extended outwardly, downwardly, and thence inwardly presenting an inwardly facing raw edge of metal and forming an inwardly facing continuous channel, and an outer cap telescoped over the inner cap and including a depending flange, said flange having its lower marginal portion folded inwardly and thence upwardly over and in contact with said raw edge and into the channel to thereby secure the two caps together and form an internal continuous bead, said bead in its entirety being disposed in the annular space defined by vertical downward extensions of said outer cap flange and the screw threaded portion of the attaching flange.

3. A closure comprising an inner cap having a circular attaching flange provided with screw threads, said screw threads terminating at a point short of the lower margin of the flange, said attaching flange having that portion below the threads directed outwardly and thence converging downwardly and form-- substantially V- an outer cap aring a continuousv channel shaped in cross-section,` and ranged over the inner cap and including a continuous flange, said flange having its lower end folded inwardly and upwardly to provide a continuous bead into which the downwardly converging portion of the attaching flange projects, said bead being compressed sufficiently to exert an expanding pressure on said downwardly converging portion of the attaching flange and thereby securing the caps against relative movement.

4. A closure comprising an inner cap having a circular attaching flange provided with screw threads, said screw threads terminating at a point short of the lower margin of the flange, said attaching flange having that portion below the threads directed outwardly and thence converging downwardly and forming a continuous channel substantially V-shaped in cross-section, and an outer cap arranged over the inner cap and including a continuous flange, said flange having its lower end folded inwardly and upwardly to provide a continuous bead into which the downwardly converging portion of the attaching flange projects, said bead being compressed sufficiently to exert an expanding pressure on said downwardly converging portion of the attaching flange, and thereby securing the caps against relative movement, said bead and downwardly converging portion of the attaching flange being disposed in the annular space defined by vertical downward extensions of the external surface of the outer flange and the threaded portion of the attaching flange.

5. A closure comprising an inner cap having a circular attaching flange provided with screw threads terminating at a point short of the lower margin of the flange, said flange having that portion below the threads extended outwardly and thence downwardly and inwardly to form an inwardly facing channel, and an outer cap telescoped over the inner cap and having the lower marginal portion of its depending flange folded around the lower margin of the inner cap and outwardly beneath the lower part of the threads and into the channel, the amount of outward extension of the lower portion of the innercap being sufficiently great to provide the finished closure with an entrance portion of greater interior diameter than the greatest interior diameter of the screw threaded part of the cap.

6. A sheet metal closure comprising anfinner cap having a circular attaching flange provided with screw threads, said flange having its lower marginal portion directed inwardly and presenting an inwardly facing raw edge of metal, an outer cap telescoped over the inner cap and having the lower marginal portion of its depending flange folded inwardly and upwardly into firm engagement with said raw edge to thereby secure the two caps together and against relative rotation.

7. A closure comprising an inner screw cap having a threaded skirt with its lower circular edge inwardly curled, an outer shell having a cylindrical depending skirt fitted over said inner cap, said shell skirt having a rounded bead along its lower edge rolled inwardly over the inwardly curled edge of the cap to clamp both cap and shell in a substantially cylindrical surface alinement as a closure unit.

ALFRED KOHRER.

CII 

